题目:
There are about _____ students in the school, and ____ of them are boys.
A. two thousand, three fifth
B. two thousand, three fifths
C. two thousands, three fifths
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析: 1粒子从发射源射出后向左偏转,说明受到向左的洛伦兹力,由左手定则可判断,1粒子带正点.所以选项A错误.由对选项A的分析可知,选项B正确.由图可知,2粒子在磁场中没有发生偏转,即2粒子没...